Saw-setting machine



A. DAVISON.

SAW SETTING MACHINE.

APPLICATION FILED Nov. 20, i919.

A. DAVISON.

SAW SETTING MACHINE. l APPLICATION FILED Nov. 2o, 1919.

Patented Mar. 29, 1921.

{ E)4 SHEETS-SHEET 2.

A. DAVISN.

^ SAW SETTING'MACHINE.

APPLICATION FILED 4NOV. 20, 1919.

Patented Mar; 29, 1921.,

4 SHEETS-SHEET a.

A, DAWSON. SAW SETTING MACHINE. APPLlcATloN FILED Nov. 2o. 1919.

ZZ Patented Mar. 29,1921..

4 SHEETS-SHEET 4.

j saws ot several types,

orties,

SAW-SETTNG MACHINE.

Specification of Letters Patent.

Patented raar, es, roei.

Application filed November 2D, 1919. Serial No. 339,352.

To all whom t may concern:

Be it known that l, ANDREW DAvisoN, a subject ot the King oi Great Britain, residing at Vancouver', Province of British Columbia, Canada, have invented certain new and useful improvements in Saw- Setting Machines; and l do hereby declare that the following is a full, clear, and exact descrip tion oi the invention, such as will enable others skilled in the art to which it appei tains to make and use the same.

The present invention relates to saw setting machines, and more particularly appertains to a device for setting the teeth oi band saws, wherein the teeth are struclr to properly set the same in staggered relation one wit i the other.

rlhe principal object oi the invention resides in the provision oi means 'for automati cally striking the alternate saw teeth, so that the same are evenly staggered.

e, further object is to provide a device which may be operated by hand or foot power.

ln former devices, the principal difficulty encountered was the inaccurate strike ot the hammer, resulting in the improper adjustnient or'v the saw teeth, whereas in the presentvdevice the saw is positioned on the bed of the machine in such position and consequently disposed at such angle with relation to the hammer, that an even blow or strike is imparted to each individual tooth and they are accordingly evenly staggered.

A still further object is to provide for the automatic feeding of the saw upony the lifting ot the hammer, prior to the striking et the teeth.

, Ei. further object of the invention is to provide a devicewhioh is adapted to set obviating the use ot separa-te machines for the different types and which is simple, economical ot construc-` tion and easy of operation.

ln the drawings Jforming a part of the specification Y Figure 1 is an end elevational view of the improved saw setting device mounted on suitable standards; Y

Fig. 2 is a plan elevation with portions ot the uprights in cross section;

Fig. 3 is a partial rear end elevation ot same;

Fig. d is a detail front end elevation;

Fig. 5 is a ragmental side elevation with portions in section, illustratingparticularly the saw guiding device and the die housing and die;

Fig. 6 is a plan elevation of the saw guide andtable; Fig. is a perspective view of the die, illustrating diagrammatically the position of the saw;

Fig. 8 is a tragmental plan elevation ot the saw 'feeding mechanism; and

li'g. 9 is a vertical section of one of the feeding arm connections.

My improved saw setting device is adapt ed'for band, circular and hand saws, and in this speciiication, the operation is set forth, which relates more particularly to the setting oi the teeth ot band saws, though minor changes may be resorted to, whereby hand saws may be set, and nothing in thisv speciiication will constitute a waiver to the use of the machines for setting the last mentioned type of saws.

In the drawings, the numeral 10 indicates the machine bed, which, in this instance. is supported upon the standards 11, which lat- Jpeil1 may besecured to a work table or pedesrlhe bed 10 is 'formed with a slot 12, through which extends an adjustable element which will hereinafter be more fully described.

Formed integral with the machine bed` or suitably attached to the upper surface thereot, is the saw set trame 13, comprising the spaced uprights 1li, 15 and 16, which latter are connected together at their upper ends and this connecting` portion 17 is formed with an annular flange 18.

rlhe upright 14 has secured to its outer edge a pair ot blocks 19, and slidablv mounted in said blocks 19 is the hammer rod 20, carrying on its lower end the detachable hammer 21. The upper end or" said hammer rod 19 has connected thereto a cylindrical restricted shank 22, the upper end or" which is slidably mounted in an exteriorly threaded bushing 23, mounted inthe threaded opening of the annular iange 18. A spring 241 eneircles shank 22 having its opposite ends engaging the oft-set portion 25 of the hammer rod 2O and the lower end oi said hushing 23. The upper end of the bushing- 23 carries a cap nut 26, which, when adjusted, serves to in turn adjust the bushing 23 to compress or relax the spring 24 whereby the stroke or striking force ot the hammer 21 is regulated.

For holding` the band saw, which in this instance is designated by the numeral 27, in position beneath the hammer 21, provide a saw guide table 28, which comprises the base portion 29 hingedly connected at 29 to oifset extension 30 ot the machine bed, and being vertically adjustable by means of the screw bolt 31, the upper square end 32 of which takes into the channel 33 of said guide table 28.

Table 28 is formed with rearwardly directed shank portions 34, to which is secured by means ot bolts a cross arm or bracket 36. Likewise table 28 is provided with a front opening. lracket is provided with an interiorly threaded opening in which is mounted the threaded bolt A die block 38 lits into a square opening in table 28 and is itormed on its base lwith a square shank 39, which seats into an opening provided therefor in the offset portion 3l) oiz base l0 of the machine. T he upper or striking sur-tace oi" the die block 33 and comprising the die, across which the saw 97 is passed, is formed with a ilat wl"-shaped portion 39' and the other halt ot the top surface o'f said die 38 is torn ed with a centrali;7 disposed downward y inclined 40. The sur iaces 4l ot the dic` disposed immediately at each side oi tlange 40 are directed downwardly at a greater angular degree than the degree of angulatiou of the said flange 40.

For centering` the band saw 2T upon the die block o plate 4l is provided, which is secured to the lower end ot the threaded bolt 37. This plate 4l is formed with slotted extensions 42, and bolts 43 arranged in said slots carry,r rollers 44 upon their lower ends, wnile the upper ends ot said bolts 43 carry adjusting nuts 45. A. spring 46 is au ranged on the bolt 37 between plate 4l' and the lower surface oi: the bracket 36, and when the nut 46 is adjusted on bolt 37, the plate 4l is adjusted to or from the saw blade 27, which latter is positioned thereunder. ln this position the lower tace of sai-L plate 4l will engage the upper surface oi the band saw, as illustrated in Figs. 5 and 5 and hold the saine upon the die block 38.

The saw when so positioned will have its straight edge portion engaging rollers 4401i plate 4l', while the Ateeth will project over upon the central die part 40 and over the inclined surfaces 4l. y

The hammer rod 2O is actuated in the ollowing` manner: Shafts 47, 48 and 49V are mounted in housing tubes 50 or sectional form, the said sections being connected together by bolts and nuts 5l and 52. The opposite ends oiE said shafts 47, 48 and 49have bearings in the uprights l5 and 16, and the inner ends ot said shafts carry intermeshing gears 53, 54 and 55. Motion is imparted to these gears 53, 54 and 55 through a crank handle 56 on shaft 47. The sha-ft 48 carrying the central gear 54 has secured to the end extending through said gear, a segmental cam 57 formed with a lobe portion 58, the outer peripheral edge of the lobe portion of said cam correspondinLr with the curved edge portion 59 thereof.

The cam 57 is likewise formed with an inclined edge portion 60 which terminates in an arcuate slot 6l.

rlhe hammer rod 20 carries a. cylindrical tripping rod 62, which passes through a longitudinal slot 63 in the Ytrame upright 14. rllhe tripping rod 62 rides on thev peripheral edges ot cam 57, and as the said cam revolves, the lobe part 58 elevates the tripping rod 62, causing the hammer rod 2O to be elevated against the tension ot spring 24. YWhen the peak of the cam has been passed, the tripping rod will be released from the cam edge and will thus fall downwardly. Thus the hammer rod 2() is released and the spring Q4 will torce` the said rod 20 downwardly and the hammer 2l into engagement with one or' the saw teeth.

Each alternate` saw tooth is struck in this manner by the hammer 2l, and due to the inclined central part 4G of the die plate.` the teeth are struck outwardly in staggered relation one with the other. Likewise, the anguiar portions 4l of the die plat-e provides clearance tor the teeth in their passage across the said die plate.

For automatically feeding the band saws to the die plate upon the elevation ot the setting hammer, l provide a mechanism which will be described as follows:

Shaft 49 carrying gear 55 has its opposite end projecting from beyond the upright 16, and mounted on this shaft extension is a crank wheel 63, which revolves in the open ing l2 ot the. bed plate 10.

Crank wheel 63 is formed on its outer tace with a slot (i4 in which is mounted an adjusting block 65 provided with longitudinal channels 66. A pin shaft 67 is secured at the central part of block G5 and loosel connected at their inner ends to said shaft 67 are the crank lirms 63 and 69. The outer ends of .said crank arms 68 and 69 are formed with vertically disposed lenlargemeirts which latter are biturcated to form annular flanges 70 and 7l which are 'spaced by the bifurcation slots 72. Mounted in the slots 7 2 at the ends oi.' crank arms 68 and 69 are the knuckle members 7 3 and 74 and pins 75 connect the said knuckle members 73 and 74 with the annular flanges 70 and 7l of the crank arms 68 and 69, thereby forming a universal connection therebetween.

Levers and 81 are pivotally mounted at the central part on pins 82 mounted in the machine bed 10 and nuts 83 are disposed on the said pins 82 for holding the same in position on said bed. Levers 8() and 81 are formed with cylindrical reduced outer ends 85, while the forward ends of said levers have pivotal connection 86 with arms 87 and 88 slidably mounted in the guide plates 89 at the sides of the front upright 14. Plates 89 have secured in their base portion 90 the bolts 91 which extend upwardly through the elongated slots 92 formed in the arms 87 and 88.` rlhe inner ends of arms 87 and 88 have pivotally mounted therein, the pawl members 93, having spear points 94; adapted to engage the teeth of the saw and being capable of movement inwardly toward each other, being tensioned by blade springs 93.

The reduced ends 85 of the levers 8O and l8l extend through horizontal slots 95 in blocks 96 and the oscillatory movement of the levers 80 and 81 on their pivotal connections 82 is thus limited.

rThe vertical portion 97 of guide plates 89 serves to guide the toothed portion of the saw in its travel across the machine bed 10.

For regulating the throw of the crank arms 68 and 69 and consequently the feeding of the saw to the hammer 21, the block 65 may be adjusted in channel 66 of crank wheel 63, so that pin shaft 67 is disposed below the axial center of shaft 19 carrying the said pulley. e

Screws 98 pass through the channels 66 of block 65, and when adjusted serve to hold the said block in position.

By adjusting block 65 outwardly from the axial point of the crank wheel 63, the shaft 67 may be adjusted to regulate the throw of crank arms 68 and 69.

In operation, the pawl members 93 are actuated by the above recited mechanism upon the elevation of the hammer rod 20, or that is to say after the hammer 21 has struck a tooth of the saw 27 upon the die plate 38. Each alternate tooth of the saw is stamped or struck by the hammer 21 and disposed in staggered relation to each other and the degree of striking pressure or blow is, as before stated, regulated by adjusting the bushing 23.

ln this manner the saw is guided across the bed plate of the machine and intermittently moved over the die plate,

Having thus fully described my invenvion, what l claim as new and desire to secure by Letters Patent is:

1. A saw set machine comprising a table and uprights, shafts journaled '1n said uprights, a hammer rod supported upon one of said uprights, a hammer connected to said hammer rod, an adjustable resilient element connected to said hammer rod, gears mounted on said shafts, a pin carried by said hammer rod, a cam arranged on one of said shafts for operating said hammer rod, a saw feed mechanism, operative connections between one of said shafts and said saw feed mechanism, means for actuating the hammer rod and means for operating the feeding mechanism simultaneously with the hammer rod.

2. A saw feed machine comprising a bed, an upright frame mounted on said bed, a hammer rod supported on said frame, shafts journaled in said frame, gears carried by said shafts and adapted for intermeshing engagement with each other, a cam arranged on one of said shafts, a crank handle arranged on another of said shafts, a pin mounted on said hammer rod and adapted for intermittent engagement with said cam for elevating said hammer, a crank wheel mounted on the lower of said shafts, a pin shaft arranged on said crank wheel, crank arms connected to said pin shaft, levers pivotally mounted on said bed, said arms being flexibly connected to said levers, arms connected to said levers, pawls pivotally mounted on the last mentioned arms, said pawls adapted for engagement with the saw for feeding the same to the hammer, a saw guide table, means for adjusting said table, and means for simultaneously operating the hammer' rod and saw feeding mechanism.

3. A saw feed machine comprising a bed, an upright frame mounted on said bed, a

hammer rod supported on said frame, shafts journaled in said frame,gears carried by said shafts and adapted for intermeshing engagement with each other, a cam arranged on one of said shafts, a crank handle arranged on another of said shafts, a pin mounted on said hammer rod and adapted for intermittent engagement with said cam for elevating said hammer, a crank wheel mounted on the lower of said shafts, a pin shaft arrangedon said crank wheel, crank arms connected to said pin shaft, levers pivotally mounted on said bed, said arms being flexibly connected to said levers, arms connected to said levers, pawls pivotally mounted on the last mentioned arms, said pawls adapted for engage ment with the saw for feeding the same to the hammer, a saw guide table, means for adjusting said table, means for simultaneously operating the hammer rod and saw feeding mechanism, and means for regulating the feed of the saw.

In witness whereof l have hereunto set my hand.

ANDREW Davison. 

